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- W248824564 abstract "The apparent second-order rate constants (k N ) have been dissected into the microscopic rate constants (i.e., k 1 and k 2 /k -1 ) associated with the reactions of Y-substituted phenyl cinnamates (5a-g) with piperidine and morpholine on the assumption that the reactions proceed through a stepwise mechanism with a change in the rate-determining step (RDS). The k 1 value is larger for the reactions with the more basic piperidine, and increases with decreasing the basicity of the leaving aryloxides. However, the k 2 /k -1 ratio is almost the same for the reaction of 3,4-dinitrophenyl cinnamate (5a) with piperidine and for that with morpholine, which is not possible if the reactions proceed through a stepwise mechanism. Thus, the aminolysis of 5a-g has been proposed to proceed through a concerted mechanism. The activation parameters (ΔH‡ and ΔS‡) have been measured for the reactions of 3,4-dinitrophenyl benzoate (la) and cinnamate (5a) with morpholine from the kinetic study performed at 5 different temperatures in 80 mol % H 2 O/20 mol % DMSO. The reaction of 5a results in a lager enthalpy of activation (ΔH‡) but a less negative entropy of activation (ΔS‡) than that of la." @default.
- W248824564 created "2016-06-24" @default.
- W248824564 date "2008-03-20" @default.
- W248824564 modified "2023-09-24" @default.
- W248824564 title "Aminolysis of 3,4-Dinitrophenyl Cinnamate and Benzoate 2: Activation Parameters and Transition-State Structures" @default.
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- W248824564 doi "https://doi.org/10.5012/bkcs.2008.29.3.575" @default.
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